JP5131357B2 - Vehicle control device - Google Patents

Abstract

Providing a control apparatus for a vehicle having a parking lock device 50 which is placed in its released state with a hydraulic pressure generated by an oil pump 58 operated by an engine 26, which control apparatus permits reduction of a risk of unintended releasing of the parking lock device 50 upon occurrence of an operating failure of an ON-OFF switching valve 72 or a switching valve 70 of a hydraulic device 69 provided to supply the hydraulic pressure. Engine start restricting means 92 is configured to restrict starting of the engine 26 when a component of the hydraulic device 69 provided to operate the parking lock device 50 has an operating failure that causes the parking lock device 50 to be held in its released state, as compared with the starting when the component does not have the operating failure, so that the engine start restricting means 92 reduces a risk of releasing of the parking lock device 50 due to application of the hydraulic pressure from the hydraulic device 69 to the parking lock device 50, which application would be caused by the starting of the engine 26.

Description

  The present invention relates to a vehicle control device, and more particularly to control of a vehicle having a parking lock device that performs actuation and release control by hydraulic pressure.

  An automatic transmission for a vehicle, which is called shift-by-wire (SBW), performs a shift by a hydraulic circuit being switched according to a travel position in accordance with an electrical command signal sent via a wire (wire). Yes. The parking lock device that restricts the rotation of the output shaft in such an automatic transmission is performed by an actuator that operates based on a command signal generated by an operation to the parking (P) position. Patent Document 1 discloses a technique that uses hydraulic pressure as an actuator of the parking lock mechanism.

  According to the technique disclosed in Patent Document 1, the parking lock device is operated by the urging force of the spring, that is, the rotation of the output shaft is restricted, while the parking state is set to the operation state by the force obtained by the valve operated by hydraulic pressure. The lock device is released and the output shaft is allowed to rotate.

JP-T-2002-533631

  In the parking lock device that can be switched between the operation state and the release state by using the hydraulic pressure as described above, for example, a failure occurs in a member constituting the hydraulic device such as a valve or a cylinder, and a valve spool or a cylinder piston is specified. There is a case that sticks (fixed) to the position of, and does not move. When such a state occurs, the hydraulic pressure output from the hydraulic device corresponds to the position where the sticked member is stuck. For example, in the hydraulic device that drives the parking lock device, when a member constituting the hydraulic device sticks to a position where the hydraulic output is such that the parking lock device is released, the parking lock device is The hydraulic pressure for releasing is continued to be supplied.

  On the other hand, generally in a vehicle, hydraulic pressure is supplied from an oil pump driven by a drive source. Therefore, when the drive source is stopped, the oil pump is also stopped and no hydraulic pressure is supplied. Therefore, as in the technique disclosed in Patent Document 1 described above, in the parking lock device that is activated by an urging force that does not depend on hydraulic pressure, such as a spring, and is released from the activated state by hydraulic pressure, as described above. Even when the components constituting the hydraulic device stick to a position where the parking lock device is in a released state so that the hydraulic output is released, when the drive source stops and the supply of hydraulic pressure stops, the hydraulic pressure does not depend The parking lock device can be operated by the biasing force.

  However, in this configuration, although the parking lock device is operating while the drive source is stopped, there is a problem that the parking lock device may be released when the drive source is started.

  The present invention has been made against the background of the above circumstances. The object of the present invention is to provide a vehicle having a parking lock device that is released by hydraulic pressure supplied from an oil pump driven by a drive source. An object of the present invention is to provide a vehicle control device that can reduce unintentional release of the parking lock device even when a component of a hydraulic device that supplies hydraulic pressure fails.

  To achieve this object, the invention according to claim 1 is: (a) a drive source, a power transmission device that transmits a driving force supplied from the drive source to the drive wheels, and the power transmission device is in a power cutoff state. And a parking lock device that fixes the output shaft of the power transmission device in a case where the power transmission device is used. (B) The parking lock device is deactivated by the hydraulic pressure supplied from the oil pump driven by the drive source. (C) A failure has occurred in a component of a hydraulic device for driving the parking lock device so that the released state of the parking lock device continues. In this case, it is characterized by having a drive source start suppressing means for suppressing start of the drive source as compared with the case where the failure does not occur.

  According to a third aspect of the present invention, there is provided: (a) a drive source, a power transmission device that transmits the driving force supplied from the drive source to the drive wheels, and the power transmission device in a power cutoff state. A parking lock device that fixes the output shaft of the power transmission device, and (b) the parking lock device releases the operation by hydraulic pressure supplied from an oil pump driven by a drive source. In the vehicle control device, (c) when a failure has occurred in a component of the hydraulic device for driving the parking lock device so that the release state of the parking lock device continues, It has the drive source stop suppression means which suppresses the stop of a drive source, It is characterized by the above-mentioned.

  According to the first aspect of the present invention, the drive source start suppressing means causes a failure in the constituent members of the hydraulic device for driving the parking lock device so that the released state of the parking lock device continues. In the case where the failure occurs, the start of the drive source is suppressed as compared with the case where the failure does not occur, and accordingly, the hydraulic device is switched to the parking lock device as the drive source is started. Oil pressure is supplied, and the parking lock device is prevented from being released.

  Preferably, the drive source start suppressing means prohibits the start of the drive source when the braking force by the braking means for applying a braking force to the vehicle is not applied. In this way, when the braking force is not applied to the vehicle by the braking means, the start of the drive source is prohibited, so that the parking lock device is released as the drive source is started. Even in such a case, it is possible to suppress a shortage of the braking force of the vehicle.

  According to the invention of claim 3, the drive source stop suppressing means causes a failure in the constituent members of the hydraulic device for driving the parking lock device so that the released state of the parking lock device continues. When the drive source is stopped, the stop of the drive source is suppressed. Therefore, when the drive source is stopped and then restarted, the hydraulic device is switched to the parking lock device as the drive source is started. Oil pressure is supplied, and the parking lock device is prevented from being released.

  Preferably, the drive source stop suppression unit prohibits the stop of the drive source when a braking force by a braking unit that applies a braking force to the vehicle is not applied. In this way, when the braking force is not applied to the vehicle by the braking means, the stop of the drive source is prohibited. Therefore, when the drive source is stopped and then restarted, the drive source is Even when the parking lock device is released as the vehicle is started, it is possible to suppress a shortage of the braking force of the vehicle.

It is the schematic of the power transmission device in the vehicle with which this invention is applied suitably. It is a figure explaining the operation position of the shift lever and parking operation switch which are shown in FIG. It is a figure explaining the outline | summary of the parking lock apparatus of FIG. 1, and the hydraulic device which drives it. It is a functional block diagram explaining the principal part of the control action of the electronic controller of FIG. It is a figure explaining the structure of the detent plate in FIG. FIG. 5 is a flow chart for explaining the control operation when an engine stop command signal is output, which is an outline of the control operation by the electronic control device of FIG. 4. FIG. FIG. 5 is a flow chart for explaining the control operation when an engine start command signal is output, which is an outline of the control operation by the electronic control device of FIG. 4. FIG.

Explanation of symbols

10: Automatic transmission (power transmission device)
24: Output shaft 26 of the power transmission device: Engine (drive source)
50: Parking lock device 52: Parking brake (braking means)
58: Oil pump 64: Drive wheel 90: Engine stop suppression means (drive source stop suppression means)
92: Engine start suppression means (drive source start suppression means)
100: Electronic control device (vehicle control device)

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram for explaining an example of a configuration of a vehicle to which the present invention is applied and for explaining a main part of a control system of the present invention. As shown in FIG. 1, the driving force supplied from the engine 26 that is a driving source is input to the input shaft 22 of the automatic transmission 10 via a torque converter 28 or the like. The automatic transmission 10 that is a power transmission device shifts the rotation of the input shaft 22 and outputs it from the output shaft 24. In this embodiment, the input shaft 22 is a turbine shaft of the torque converter 28, for example. Further, the output shaft 24 rotationally drives the left and right drive wheels 64 sequentially via, for example, a differential gear device (final reduction gear) 60, a pair of axles 62, and the like.

  The electronic control device 100 includes, for example, a so-called microcomputer having a CPU, a RAM, a ROM, an input / output interface and the like. The CPU uses a temporary storage function of the RAM and follows a program stored in the ROM in advance. By performing signal processing, output control of the engine 26, shift control of the automatic transmission 10, and the like are executed, and hydraulic friction engagement (not shown) for engine control and automatic transmission 10 is performed as necessary. It is configured separately for shift control for controlling a linear solenoid valve that drives the device.

In Figure 1, the sensors and switches (not shown) provided in the vehicle, for example, a crank angle (position) ACR (°) and the crank position sensor, a torque converter 28 that detects a crank position corresponding to the rotational speed N _E of the engine 26 A turbine rotational speed sensor for detecting a turbine rotational speed _{NT of the} automatic transmission 10, that is, a rotational speed N _IN of the input shaft 22 of the automatic transmission 10, an output shaft rotational speed sensor for detecting a rotational speed N _OUT of the output shaft 24 corresponding to the vehicle speed V, intake air quantity sensor, the manual shift lever position of the shift lever 40 as an operating device (operating position) of the shift position sensor 42 and the shift position to detect the P _SH P (parking) position for detecting an intake air quantity Q _aIR of the engine 26 Parking operation switch 41 for An accelerator opening sensor for detecting an accelerator opening Acc is an operation amount of the accelerator pedal, a throttle position sensor for detecting angular i.e. throttle valve opening theta _TH opening of the electronic throttle valve provided in an intake pipe, a foot is a service brake A brake switch for detecting a brake operation signal B _ON indicating whether or not a brake is operated, a parking brake switch 54 for detecting a parking brake operation signal P _BON indicating whether or not a parking brake is operated, and a temperature of hydraulic oil in the hydraulic control circuit 76 An AT oil temperature sensor for detecting the AT oil temperature T _OIL , an acceleration sensor for detecting the acceleration (deceleration) G of the vehicle, and a start / stop switch 56 for outputting a signal for starting and stopping the engine , Etc., crank angle (position) ACR (°) and engine Down speed NE, turbine rotation speed _N T (= input shaft rotational speed _{N IN),} the vehicle speed V, the output shaft speed _{N OUT,} the intake air quantity _{Q AIR,} lever position _{P SH,} the accelerator opening Acc, the throttle valve opening Signals representing θ _TH , brake operation signal B _ON , parking brake operation signal P _BON , AT oil temperature T _OIL , acceleration (deceleration) G, engine start command, stop command, and the like are supplied to the electronic control unit 100.

From the electronic control unit 100, an engine output control command signal S _E for controlling the output of the engine 26, for example, a drive signal to the throttle actuator for controlling the opening and closing of the electronic throttle valve and the fuel injected from the fuel injection device An injection signal for controlling the amount, an ignition timing signal for controlling the ignition timing of the engine 26 by the igniter, and the like are output. Further, a shift control command signal S _P for shift control of the automatic transmission 10, for example, excitation or de-excitation of a linear solenoid valve provided in the hydraulic control circuit 76 for switching the shift stage of the automatic transmission 10 is performed. a driving signal to the linear solenoid valve for controlling the valve command signal and the line pressure P _L for control is outputted. Specifically, for example, the automatic transmission 10 has, for example, a differential gear device, and engagement of a plurality of hydraulic friction engagement devices such as clutches and brakes connected to each rotating element of the differential gear device. A stepped automatic transmission capable of switching between a plurality of shift stages having different gear ratios by combining the state and the release state. The engagement and disengagement states of the plurality of hydraulic friction engagement devices are switched by the hydraulic pressure supplied from each of the linear solenoid valves provided in the hydraulic control circuit 76.

Further, when a “P” position, which will be described later, is selected by operating the parking operation switch 41, or a position other than the “P” position is selected from the “P” position by operating the shift lever 40. In this case, a parking lock for operating a linear solenoid valve 72 that outputs a hydraulic pressure for driving a parking lock device 50 (to be described later) in order to perform a parking lock for preventing the rotation of the output shaft 24 or to release the parking lock. Command signal S _{PK and the} like are output.

  The shift lever 40 is disposed, for example, in the vicinity of the driver's seat, and as shown in FIG. 2, there are three “R” position, “N” position, “D” position arranged in the longitudinal direction of the vehicle, and The H-shaped pattern is operated to the “+” position, “B” position, and “−” position for manual operation arranged in parallel. In this embodiment, a parking operation switch 41 for operating the P position and locking the parking is provided as a separate switch.

  The “R” position is a reverse travel position (position) for reversing the rotation direction of the output shaft 24 of the automatic transmission 10, and the “N” position interrupts power transmission in the automatic transmission 10. The neutral position is a neutral state, and the “D” position is a shift range (D range) that allows the automatic transmission 10 to change gears, and all of the first gear stage “1st” to the eighth gear stage “8th”. Is a forward travel position that executes automatic shift control using a forward gear position, and the “B” position is a plurality of types of shift ranges that limit the change range of the gear stage, that is, a plurality of types of shifts with different gear stages on the high vehicle speed side. This is a forward travel position that allows manual shifting by switching the range. The “P” position selected by the operation of the parking operation switch 41 releases the power transmission path in the automatic transmission 10, that is, a neutral state (neutral state) in which the power transmission in the automatic transmission 10 is interrupted, and mechanical parking. This is a parking position for mechanically preventing (parking lock) rotation of the output shaft 24 by a mechanism.

  In the “B” position, a “+” position for shifting the shift range up each time the shift lever 40 is operated, and a “−” for shifting the shift range down each time the shift lever 40 is operated. Position is provided. For example, in the “B” position, any of the plurality of shift speeds of the automatic transmission 10 is changed according to the operation of the ft lever 40 to the “+” position or the “−” position.

  The “D” position is a shift position for selecting an automatic transmission mode that is a control mode in which automatic transmission control is executed within the range of shift speeds of the automatic transmission 10, and the “B” position is an automatic transmission 10. The automatic shift control is executed within a range that does not exceed the maximum speed gear of each shift range, and the manual shift control is performed based on the shift range changed by manual operation of the shift lever 40 (that is, the maximum speed gear). It is also a shift position for selecting a manual transmission mode that is a control mode to be executed.

  Returning to FIG. 1, the parking lock device 50 prevents the rotation of the output shaft 24 of the automatic transmission 10 when the “P” position is selected by the parking operation switch 41. Details will be described later.

  The parking brake lever 52 is a lever operated to operate and release the parking brake, and the parking brake lever 52 and a parking brake (not shown) are connected by a cable (not shown). For example, when the parking brake lever 52 is pulled, the parking brake is operated to apply a braking force to the vehicle, and the parking brake switch 54 detects that the parking brake lever 52 has been pulled, Is informed to the electronic control unit 100. In addition, the parking brake lever 52 has a ratchet mechanism, for example, so that the parking brake lever 52 can be maintained in a state in which the parking brake lever 52 is pulled, that is, the parking brake is in operation, and can be released. ing.

  The start / stop switch 56 is, for example, a so-called ignition key, and supplies a signal for starting and stopping the engine 26 as a power source to the electronic control unit 100 when a predetermined operation is performed by the driver.

  FIG. 3 is a diagram for explaining the configuration of the parking lock mechanism 50 that performs parking lock when the “P” position is selected by operating the parking operation switch 41, the configuration of the hydraulic device that drives the parking lock mechanism 50, and the like. It is.

  The parking lock mechanism 50 includes a shaft 102 that is rotationally driven by a crank 48 that will be described later, a detent plate 120 that is fixed to the shaft 102 and rotates with the shaft 102, a rod 104 that moves in the longitudinal direction as the detent plate 120 rotates, The parking gear 108 fixed to the output shaft 24 of the automatic transmission 10, the parking lock pole 106 fixed to the case (not shown) to lock the parking gear 108, and the rotation of the detent plate 120 are moderated. A detent spring 110 that is fixed at each shift position, which will be described later, and a roller 112 provided at the tip of the detent spring 110 are provided.

  The detent plate 120 is operatively connected to a rotating member 48 of a crank mechanism 47, which will be described later, via a shaft 102, and is driven by the crank mechanism 47 together with the rod 104, the detent spring 110, the rollers 112, and the like to shift the transmission. It functions as a shift positioning member for switching the position. The shaft 102, the detent plate 120, the rod 104, the detent spring 110, and the rollers 112 serve as a shift switching mechanism.

  As shown in FIG. 5, at the top of the detent plate 120, there are four valleys corresponding to the P position, R position, N position, and D position, which are the shift positions, between a pair of inner wall surfaces 126 and 128, respectively. Are provided, and the valley 124 located at the end of them corresponds to the P position. In this embodiment, the shift positions that are the P position, the R position, the N position, and the D position are the P position, the R position, the N position, and the shift positions selected by the shift lever 40 and the parking operation switch 41, respectively. And D position respectively. The B position corresponds to the D position. Of the shift positions, the R position, the N position, and the D position are referred to as non-P positions.

Returning to FIG. 3, the parking lock mechanism 50 in FIG. 3 shows a state when the shift position is the P position. In this state, the parking lock pole 106 locks the parking gear 108 and the rotation of the drive shaft of the vehicle is prevented. In this embodiment, this state is referred to as a state in which the parking lock mechanism 50 is operating. From this state, the parking lock command signal S _PK for releasing drive the actuation of the parking lock mechanism 50 from the electronic control unit 100 is output by the crank mechanism 47, in the direction of arrow C shown the shaft 102 in FIG. 3 When rotated, the rod 104 is pushed in the direction of arrow A shown in FIG. 3 through the detent plate 120, and the parking lock pole 106 is moved in the direction of arrow B shown in FIG. 3 by the taper member 114 provided at the tip of the rod 104. Pushed down. As the detent plate 120 rotates, the valley located at the end of the four valleys provided at the top of the detent plate 120 corresponding to the P position, the R position, the N position, and the D position, that is, shown in FIG. The roller 112 of the detent spring 110 in the P position 124 passes over the mountain 122 and moves to one of the other valleys, that is, the non-P position 121 (see FIG. 4). The roller 112 is provided on the detent spring 110 so as to be rotatable about its axis. When the detent plate 120 rotates in the C direction until the roller 112 reaches the non-P position 121, the parking lock pole 106 is pushed down to a position where it does not engage with the parking gear 108. As a result, the output shaft 24 and the drive wheels 64 of the vehicle connected thereto are not mechanically fixed, and the shift position is switched to the non-P position. When the shaft 102 is rotated in the D direction by the electric actuator 44, the shift position is switched to the P position by the reverse operation.

  Further, the rotary encoder 46 outputs a pulse signal for acquiring a count value (encoder count) corresponding to the drive amount of the crank mechanism 47, that is, the rotation amount of the rotary member 48. Based on the output of the rotary encoder 46, it is detected whether the shift position is at the P position or the non-P position. The rotation amount of the rotation member 48 corresponds to the rotation amount of the shaft 102 of the parking lock device 50. The P position is a P position range in which it is experimentally obtained in advance or by simulation that the parking gear 108 is securely locked by the parking lock pole 106. That is, the rotary encoder 46 functions as a parking lock sensor for detecting whether the parking lock device 50 is in an activated state or a released state.

  FIG. 3 also shows an example of a configuration of a hydraulic device 69 for driving the parking lock device 50, and is a hydraulic circuit diagram configured by a hydraulic control circuit 76 (see FIG. 1) and the like.

The mechanical oil pump 58 is driven to rotate by the engine 26 to generate a hydraulic pressure that is a source pressure. The hydraulic pressure generated by the oil pump 58 is regulated to a predetermined line hydraulic pressure P _PK (parking release line pressure P _PK ) by, for example, a relief type pressure regulating valve 68.

OFF switching valve 72 is an electromagnetic solenoid valve for example, in accordance with the parking lock command signal S _PK supplied from the electronic control unit 100 supplies a signal pressure P _SP to the switching valve 70 to be described later. In the present embodiment, on-off changeover valve 72 supplies a signal pressure P _SP when the parking lock command signal S _PK is the control input is on, the signal pressure when a parking lock command signal S _PK is off to stop the supply of P _SP. When the electronic control device 100 determines that the parking lock device 50 is to be operated, the parking lock command signal _SPK is turned on, and when the parking lock device 50 is to be released, the parking lock command signal S is turned on. _PK is turned off.

The switching valve 70 has an input port, a drain port, and an output port. Switching valve 70, when the signal pressure P _SP is not supplied, an input port communicating with the pressure regulating valve 60, so as to communicate the output port communicating with the hydraulic actuator 74 to be described later, with such a spring having therein The spool inside the switching valve 70 is positioned by the force. On the other hand, when the signal pressure _PSP is supplied, the spool is moved and the drain port EX communicating with the drain communicates with the output port.

The hydraulic cylinder 74, which is a hydraulic actuator, urges the piston 76 in a direction opposite to the oil chamber 77 that receives the hydraulic pressure supplied from the switching valve 70, the piston 76, and the force applied to the piston 76 by the hydraulic pressure in the oil chamber 77. And a spring 78. When the hydraulic pressure P _PK is supplied from the switching valve 70 to the oil chamber 77, the piston 76 is moved to a position where the hydraulic pressure P _PK and the urging force of the spring 78 are balanced. Further, the crank rod 49 of the crank mechanism 47 is fixed to the piston 76. The crank mechanism 47 converts the linear motion of the piston 76 input through the crank rod 49, that is, the operation in the direction EF in FIG. 3 into the rotational direction of the rotating member 48, that is, the motion in the direction CD in FIG. To do. The rotating member 48 and the shaft 102 of the parking lock device 50 are fixed, and the rotating member 48 performs a rotational motion around the shaft 102.

Since the hydraulic device 69 and the parking lock device 50 is configured, when operating the parking lock device 50, first, the parking lock command signal S _PK is turned on output from the electronic control circuit 100. When the parking lock command signal S _PK is turned on, allowed to output the signal pressure P _SP from OFF switching valve 72, as a result, the switching valve 70, an output port and the drain leading to the oil chamber 77 of the hydraulic cylinder 74 It is switched so as to communicate with the port EX. In the hydraulic cylinder 74, the hydraulic pressure in the oil chamber 77 is discharged from the drain port of the switching valve 70, so that the piston 76 of the hydraulic cylinder 74 is moved in the F direction in FIG. Moved. Then, the shaft 102 of the parking lock device 50 is rotated in the direction D in FIG. In this way, when the roller 112 is positioned at the P position of the detent plate 120, the parking lock pole 106 is pushed up to fix the parking gear 108, so that the operating state of the parking lock device 50, that is, the automatic transmission 10 The output shaft 24 is fixed.

On the other hand, when the parking lock device 50 in an actuated state is released, the parking lock command signal S _PK outputted from the electronic control circuit 100 is turned off. Then, the output of the signal pressure P _SP from OFF switching valve 72 is stopped, as in the switching valve 70, the hydraulic pressure P _PK whose pressure regulated by the pressure regulating valve 68 is supplied to the oil chamber 77 of the hydraulic cylinder 74 oil passage Is communicated. When the pressing force _by hydraulic pressure P _PK supplied to the oil chamber 77 exceeds the biasing force of the spring 78, the piston 76 is moved in the E direction in FIG. 3. The movement of the piston 76 is converted by the crank mechanism 47 into rotation of the shaft 102 in the direction C in FIG. When the roller 112 is moved from the P position of the detent plate 120 to the non-P position, the parking lock pawl 106 is pushed down in the direction B in FIG. 3 so that it does not mesh with the parking gear 108 and the parking lock device 50 is released. It will be in the state.

  By the way, in a member such as a valve constituting the hydraulic device, a failure such as disconnection, short circuit, or sticking (fixing) of the electromagnetic valve may occur. If such a failure occurs, the hydraulic pressure may not be supplied to the intended location.

Specifically, for example, in the present embodiment, on-off in the switching valve 72, when the spool is failure occurs such as accidentally sticks, not command pressure P _SP regardless off the parking lock command signal S _PK is always output or it is a, or may sometimes result in a state of communicating the input port and the output port failure occurs, leading the regulating valve 68 regardless of the input likewise command pressure P _SP in the switching valve 70. When these fail occurs, regardless of the on-off of the parking lock command signal S _PK, since the hydraulic pressure regulated by the regulator valve 68 is supplied to the oil chamber 77 of the hydraulic cylinder 74, is released in the parking lock device 50 The state will continue.

On the other hand, when the oil pump 58 is driven by the driving force source as in this embodiment, the supply of the original pressure by the oil pump 58 is not performed while the engine 26 that is the driving force source is stopped. Therefore, even when the switching valve 70 causes the oil chamber 77 of the hydraulic cylinder 74 to communicate with the discharge port EX while the engine 26 is stopped, the pressure regulating valve 60 and the oil chamber 77 of the hydraulic cylinder 74 are connected to each other. Even when communicating, the parking lock hydraulic pressure P _PK is not supplied to the oil chamber 77 and the hydraulic pressure in the oil chamber 77 is discharged. That is, the parking lock device 50 is operated while the engine 26 is stopped.

  In such a configuration, for example, when the on / off switching valve 72 or the switching valve 70 fails as described above, the pressure regulating valve 68 and the oil chamber 77 of the hydraulic cylinder 74 are in communication with each other. When the engine 26 is started, the parking lock device 50 that is in an operating state while the engine 26 is stopped may be in a parking lock release state after the engine 26 is started.

  FIG. 4 shows that a failure occurs in a main part of the control function of the electronic control device 100, that is, a component of the hydraulic device 69 that drives the parking lock device 50, and the pressure regulating valve 68 and the oil chamber 77 of the hydraulic cylinder 74 are communicated. FIG. 6 is a functional block diagram for explaining a main part of a control function when engine 26 is stopped and started when the engine 26 is in a closed state.

The shift control means 80 includes parameters such as a shift position P _SH that is the position of the shift lever 40 detected by the shift position sensor 42, whether or not the P position is selected by the parking operation switch 41, vehicle speed V, and accelerator pedal opening Acc. And a shift stage of the automatic transmission 10 is determined based on a relationship such as a shift diagram stored in advance. Further, the shift control means 80 controls a solenoid valve or the like included in the hydraulic pressure control circuit 76 in order to realize the determined shift speed, and outputs a hydraulic pressure necessary for realizing the shift speed.

The parking lock execution means 82 activates the parking lock device 50 based on a signal for setting the P position from the parking operation switch 41, and the R position, N position, D position, etc. by the shift position sensor 42. When a shift position other than the P position is detected, the parking lock device 50 is released. By specifically for outputting a parking lock command signal S _PK for driving the on-off switching valve 72 included in the hydraulic control circuit 76 for example, to drive the hydraulic device 69, it releases the actuation state of the parking lock device 50 state Switch between and.

  The abnormality detection unit 84 detects an abnormality of the hydraulic device 69, specifically, a state in which the parking lock device 50 is not activated even though the parking lock execution unit 82 has instructed execution of the parking lock. In the present embodiment, for example, the state where the pressure regulating valve 68 and the oil chamber 77 of the hydraulic cylinder 74 are in communication with each other due to the failure of the on / off switching valve 72 and the switching valve 70 which are components of the hydraulic device 69 continues. This is the case.

  Specifically, the abnormality detection means 84 is based on the signal for selecting the P position output from the parking operation switch 41 and the output of the rotary encoder 46 for detecting the rotation amount of the shaft 102 of the parking lock device 50. Thus, the occurrence of a state in which the parking lock device 50 is not activated even though the parking lock execution means 82 has instructed execution of the parking lock is detected. That is, based on the output of the rotary encoder 46, the parking lock device 50 is activated within a predetermined time after the signal for selecting the P position is output from the parking operation switch 41. The occurrence of an abnormality is detected based on the fact that it is not detected. The fact that the parking lock device 50 has been activated is determined, for example, by the output of the rotary encoder 46 that the shaft 102 has been rotated until the roller 121 is positioned at the P position 124 of the detent plate 120. In this case, it can be determined that the parking lock device 50 has been activated. Further, the predetermined time is a certain margin in the average required time from the output of the signal indicating that the P position is selected from the parking operation switch 41 until the parking lock device 50 is operated in the situation where the abnormality does not occur. It is sufficient to set in advance experimentally or by a simulation or the like as a value given.

  When the abnormality is detected, the abnormality detection means 84 turns on a P (parking) switching valve abnormality diagnosis for identifying the occurrence of the abnormality. The abnormal-time drive source control means 86, which will be described later, can detect that an abnormality has occurred based on the fact that the P-switch valve abnormality diagnosis is turned on. In addition, when detecting the abnormality, the abnormality detection unit 84 causes the notification unit 94 described later to notify the driver. This notification indicates, for example, that there is a possibility that the parking lock device 50 is out of order or that the parking brake 52 is activated before the start / stop switch 56 is operated to stop the engine 26. Is.

  The engine control means 96 starts and stops the engine 26 based on the command signal for starting the engine output from the start / stop switch 56 and the command signal for stopping the engine, respectively. Specifically, when a command signal for starting the engine is output from the start / stop switch 56, the engine 26 is rotated and started by a starter motor or the like (not shown). When a command signal for stopping the engine is output from the start / stop switch 56, the rotation of the engine 26 is stopped by stopping the ignition in the engine 26 or the like.

  When an abnormality is detected by the abnormality detection unit 84, the abnormal-time drive source control unit 86 performs a different operation when stopping and starting the drive source than when no abnormality is detected. The abnormal time drive source control means 86 includes an engine stop inhibiting means 90 and an engine start inhibiting means 92.

  When the abnormality detection unit 84 detects an abnormality, the engine stop inhibiting unit 90 outputs an engine signal by the engine control unit 96 when a command signal for stopping the engine 26 is output by the start / stop switch 56. Before the control operation for stopping 26 is executed, the following operation is performed. That is, the engine stop inhibiting means 90 instructs the engine control means 96 to stop the engine 26 when the parking brake switch 54 detects that the parking brake 52 as the braking means is on. To do. On the other hand, when it is not detected by the parking brake switch 54 that the parking brake 52 is turned on, the engine 26 is prohibited from being stopped. The engine stop suppression means 90 corresponds to the drive source stop suppression means.

  When the abnormality detection unit 84 detects an abnormality, the engine start inhibiting unit 92 outputs an engine signal by the engine control unit 96 when a command signal for starting the engine 26 is output by the start / stop switch 56. Before the control operation for starting 26 is executed, the following operation is performed. That is, the engine start inhibiting means 92 instructs the engine start means 96 to start the engine 26 when the parking brake switch 54 detects that the parking brake 52 as the braking means is turned on. To do. On the other hand, when it is not detected by the parking brake switch 54 that the parking brake 52 is turned on, the engine 26 is prohibited from starting and the driver is notified to the notification means 94 described later. Make it. This notification is, for example, to urge the parking brake 52 to operate in order to start the engine 26. This engine start inhibiting means 90 corresponds to drive source start inhibiting means.

  The notification means 94 notifies the driver, for example, via an output means 98 such as a display device or a voice output device in accordance with instructions from the abnormality detection means 84 and the engine start suppression means 92. Specifically, as described above, when the abnormality is detected by the abnormality detection means 84, there is a possibility that the parking lock device 50 is out of order, or the start / stop to stop the engine 26. In order to start the engine 26 when the engine start inhibiting means 92 prohibits the start of the engine 26, a notification that the parking brake 52 is to be activated before the switch 56 is operated. Is notified that the parking brake 52 is to be operated.

  FIG. 6 shows a main part of the control operation of the electronic control unit 100, specifically, when the start / stop switch 56 is operated during the operation of the engine 26 and a command signal for stopping the engine 26 is output. It is a flowchart explaining a control action.

  SA1 and SA2 are steps corresponding to the abnormality detection means 84. In SA1, when the parking operation switch 41 is operated and the parking position is selected, the parking lock device 50 is not activated within the predetermined time set in advance, that is, the parking lock is not performed. For example, it is determined based on the output of the rotary encoder 46. If the parking lock device 50 is not activated within the predetermined time, the determination in this step is affirmed and SA2 is executed. On the other hand, if the keying lock device 50 is activated within the predetermined time, it is determined that the hydraulic device 69 is normal, the determination of this step is denied, and this flowchart is terminated.

  SA2 is a step executed when the determination of SA1 is negative, that is, when the parking lock device 50 is not activated within the predetermined time, and is a step of the hydraulic device 69 that drives the parking lock device 50. It is determined that there is a possibility that the structural member has failed and the parking lock cannot be executed, and the P-switch valve abnormality diagnosis is turned on.

  In SA3 corresponding to the notification means 94 and the like, the driver is notified that there is a possibility that the parking lock device 50 has failed, and that the parking is performed before the start / stop switch 56 is operated to stop the engine 26. The output means 98 is used to notify that the brake 52 is to be operated.

  SA4 is a step corresponding to the engine stop inhibiting means 90 and the like. First, in SA4, whether or not the parking brake 52 is turned on by the parking brake switch 54 when the start / stop switch 56 is operated during operation of the engine 26 and a stop command signal for the engine 26 is output. Is judged. When the stop command signal for the engine 26 is output and the parking brake 52 is on, the determination in this step is affirmed and SA5 is executed. On the other hand, when the stop command signal for the engine 26 is output and the parking brake 52 is turned off by the parking brake switch 54, the determination at this step is denied and SA6 is executed.

  In SA5 corresponding to the engine control means 96, the engine 26 in the operating state is stopped. Specifically, for example, it is performed by stopping ignition by an ignition plug (not shown) in the engine 26 or stopping supply of fuel by a fuel supply valve (not shown). In the present embodiment, as described above, the supply of hydraulic pressure by the oil pump 58 is stopped when the engine 26 is stopped, so that the parking lock device 50 is activated by the biasing force of the spring 78.

  SA6 executed when the determination of SA4 is negative corresponds to the engine stop inhibiting means 90. At SA6, the engine 26 is not stopped regardless of the engine 26 stop command signal made at SA4.

  FIG. 7 shows another main part of the control operation of the electronic control unit 100, specifically, the start / stop switch 56 is operated while the engine 26 is stopped, and a command signal for starting the engine 26 is output. It is a flowchart explaining the control action | operation in a case.

  First, in SB1, it is determined whether the start / stop switch 56 is operated while the engine 26 is stopped and a start command signal for starting the engine 26 is detected. If a start command signal is detected, the determination in this step is affirmed and SB2 is executed. On the other hand, if the start command signal is not detected, the determination in this step is denied and the present flowchart is terminated.

  Subsequent SB2 to SB4 correspond to the engine start inhibiting means 92. First, in SB2, it is determined whether or not the P switching valve abnormality diagnosis is ON. The P-switching valve abnormality diagnosis is turned on when, for example, SA2 in the flowchart of FIG. 6 is executed during operation before the engine 26 is stopped. If the P-switch valve abnormality diagnosis is on, the determination in this step is affirmed and SB3 is executed. If the P-switch valve abnormality diagnosis is not on, the determination in this step is denied and SB5 is executed.

  In SB3, it is determined whether or not the parking brake 52 is turned off. This determination is made based on the output of the parking brake switch 54, for example. If the parking brake 52 is off, the determination in this step is affirmed and SB4 is executed. On the other hand, when the parking brake 52 is on, SB5 is executed.

  SB4 is a step executed when the determination of SB3 is affirmed, that is, when the P-switch valve abnormality diagnosis is on and the parking brake 52 is off. In this step, starting of the engine 26 is prohibited with respect to the start command signal of the engine 26 detected in SB1. Specifically, for example, execution of cranking for starting the engine 26 is prohibited. Further, this step SB4 corresponds to the notifying means 94, and a notification that prompts the parking brake 52 to be operated in order to start the engine 26 uses an output device 98 such as an optical display or an audio output. It is done.

  On the other hand, in the case of SB5, if either the judgment of SB2 or the judgment of SB3 is denied, that is, the parking brake 52 even if the P switching valve abnormal diagnosis is off or the P switching valve abnormal diagnosis is on. This step is executed when is on, and corresponds to the engine control means 96. In this step, the engine 26 is started based on the start command signal for the engine 26 detected in SB1.

  According to the above-described embodiment, the on / off switching valve 72 and the switching valve 70 which are components of the hydraulic device 69 for driving the parking lock device 50 by the engine start suppressing means 92 are released to the parking lock device 50. When the failure occurs so as to continue, the start of the engine 26 is suppressed as compared with the case where the failure does not occur. The hydraulic pressure is supplied from 69 to the parking lock device 50, and the parking lock device 50 is prevented from being released.

  Further, according to the above-described embodiment, the engine start suppressing means 92 prohibits the start of the engine 26 when the parking brake 52 is not turned on, so that no braking force is applied to the vehicle by the parking brake 52. In such a case, starting of the engine 26 is prohibited, and even when the parking lock device 50 is released as the engine 26 is started, it is possible to prevent the braking force of the vehicle from being insufficient.

  Further, according to the above-described embodiment, the parking lock device 50 is connected to the on / off switching valve 72 and the switching valve 70 which are components of the hydraulic device 92 for driving the parking lock device 50 by the engine stop inhibiting means 90. When the failure occurs so that the release state of the engine continues, the stop of the engine 26 is suppressed. Therefore, when the engine 26 is stopped and then restarted, the engine 26 is started. The hydraulic pressure is supplied from the hydraulic device 69 to the parking lock device 50, and the parking lock device 50 is prevented from being released.

  Further, according to the above-described embodiment, the engine stop inhibiting means 90 prohibits the engine 26 from stopping when the parking brake 52 is not turned on, so that braking force is applied to the vehicle by the parking brake 52. If the parking lock device 50 is released when the engine 26 is started when the engine 26 is started again, the braking force of the vehicle is prohibited. The shortage is suppressed.

  As mentioned above, although the Example of this invention was described in detail based on drawing, this invention is applied also in another aspect.

  For example, in the above-described embodiment, the stepped automatic transmission 10 is used as the power transmission device, but is not limited thereto. For example, the automatic transmission 10 may be a continuously variable automatic transmission that can switch the gear ratio steplessly within a predetermined gear ratio width.

  In the above-described embodiment, as a device for selecting a shift position by the driver, a shift lever 40 for selecting a shift position other than the parking position, and a parking operation switch 41 for selecting the parking position. However, the present invention is not limited to such a mode. That is, all shift positions including the parking position may be selected by the shift lever 40.

In the above-described embodiment, the parking lock device 50 is continuously provided with the parking lock oil pressure P _PK to the oil chamber 77 of the hydraulic cylinder 74 in the hydraulic device 69 in order to maintain the release state of the parking lock device 50. However, the present invention is not limited to such a mode. For example, after the parking lock device 50 is once released, for example, the piston 76 of the hydraulic cylinder 74 and the crank rod 49 of the crank mechanism 47 are fixed using a ratchet mechanism or a magnet, and the parking lock device 50 is activated again. You may make it cancel | release, when it is made to do. In this way, in order to maintain the state in which the parking lock device 50 is released, it is not necessary for the hydraulic device 69 to always supply hydraulic pressure.

  In the above-described embodiment, the hydraulic cylinder 74 is used as a hydraulic actuator. However, the present invention is not limited to this, and a hydraulic motor or a diamond negative RAM type hydraulic actuator may be used.

  In the above-described embodiment, the parking brake 52 is used as a braking unit that applies a braking force to the vehicle. What is necessary is just to be able to give a braking force to the vehicle irrespective of the state of the drive source of the vehicle, that is, whether the drive source is activated or stopped.

  In the above-described embodiment, the on / off switching valve 72 and the spool of the switching valve 70 stick as an example of a failure in the hydraulic device 69. However, the present invention is not limited to this. For example, the piston 77 of the hydraulic cylinder 74 is a stick. This is also the case.

  In the above-described embodiment, the drive source is the engine 26, but is not limited thereto. For example, you may have both an engine and a motor as a drive source.

  Further, in the above-described embodiment, the engine stop inhibiting unit 90 determines whether the parking brake 52 is on (SA4) when the stop command signal for the engine 26 is output (SA4). When is turned on, the engine 26 is stopped (SA5). When the parking brake 52 is turned off, the engine 26 is prohibited from being stopped (SA6), but the present invention is not limited to this. For example, if an abnormality is detected by the abnormality detection means 84 (SA1 is affirmative), the engine stop suppression means 90 can obtain a certain effect even if it prohibits the engine stop regardless of whether the parking brake 52 is on or off. It is done.

  In the above-described embodiment, the engine start inhibiting unit 90 outputs a start command signal for the engine 26 (SB1 is affirmative), and an abnormality is detected by the abnormality detection unit 84 (SB2 is affirmed). Based on whether or not the parking brake 52 is off (SB3), when the parking brake 52 is off, the engine 26 is prohibited from starting (SB4) while the parking brake 52 is on. In this case, the engine 26 is started (SB5), but is not limited thereto. For example, the engine start inhibiting means 90 turns on / off the parking brake 52 when a start command signal for the engine 26 is output (SB1 is positive) and an abnormality is detected by the abnormality detecting means 84 (SB2 is positive). Regardless of this, a certain effect can be obtained even if the engine is prohibited from being stopped.

  In addition, although not illustrated one by one, the present invention is implemented with various modifications within a range not departing from the gist thereof.

Claims (4)

A drive source, a power transmission device that transmits a driving force supplied from the drive source to the drive wheels, and a parking lock device that fixes an output shaft of the power transmission device when the power transmission device is in a power cut-off state The parking lock device is a vehicle control device that releases its operation by hydraulic pressure supplied from an oil pump driven by a drive source,
When a failure has occurred in a component of a hydraulic device for driving the parking lock device so that the release state of the parking lock device continues, compared to a case where the failure has not occurred A drive source start suppressing means for suppressing start of the drive source;
A control device for a vehicle. The drive source start inhibiting means prohibits the start of the drive source when a braking force is not applied by a braking means for applying a braking force to the vehicle;
The vehicle control device according to claim 1. A drive source, a power transmission device that transmits a driving force supplied from the drive source to the drive wheels, and a parking lock device that fixes an output shaft of the power transmission device when the power transmission device is in a power cut-off state The parking lock device is a vehicle control device that releases its operation by hydraulic pressure supplied from an oil pump driven by a drive source,
When a failure has occurred in a component of a hydraulic device for driving the parking lock device so that the released state of the parking lock device continues, a drive source stop suppression that suppresses the stop of the drive source Having means,
A control device for a vehicle. The drive source stop suppression means prohibits the stop of the drive source when a braking force by a braking means for applying a braking force to the vehicle is not applied;
The vehicle control device according to claim 3.

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